package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.common.exception.LyException;
import com.leyou.item.dto.SpecGroupDTO;
import com.leyou.item.dto.SpecParamDTO;
import com.leyou.item.entity.SpecGroup;
import com.leyou.item.mapper.SpecGroupMapper;
import com.leyou.item.service.SpecGroupService;
import com.leyou.item.service.SpecParamService;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class SpecGroupServiceImpl extends ServiceImpl<SpecGroupMapper, SpecGroup> implements SpecGroupService {

    private SpecParamService paramService;

    @Override
    public List<SpecGroupDTO> querySpecList(Long categoryId) {

//        查询规格组
        List<SpecGroupDTO> groupList = SpecGroupDTO.convertEntityList(query()
                .eq("category_id",categoryId).list());

        if (CollectionUtils.isEmpty(groupList)){
            throw new LyException(404,"该分类下的规格组不存在!");
        }

//        查询规格参数
        List<SpecParamDTO> paramList = paramService.queryParams(categoryId,null,null);

//        对规格参数分组，groupId一致的在一组
        Map<Long,List<SpecParamDTO>> map = paramList.stream().collect(Collectors.groupingBy(SpecParamDTO::getGroupId));

//        把参数放入group
        for (SpecGroupDTO groupDTO : groupList) {
            groupDTO.setParams(map.get(groupDTO.getId()));
        }

        return groupList;
    }
}
